JPH11297347A - Winding device for electrode body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To wind an electrode body like a belt, so as to prevent weaving by smoothing a winding speed of a winding core formed whose sectional shape is elliptical. SOLUTION: This winding device comprises a winding core 2 for winding an electrode body S like a belt whose sectional shape is formed in a manner, such that length of long axis is different from that of short axis and which is formed by overlaying positive electrodes and negative electrodes, that are like a belt mutually through an insulating sheet, a driving pulley 3 which rotates the winding core 2, whose external shape is varied to a similar figure with the sectional shape of the winding core 2 by a shape adjusting mechanism 4, and a driving belt which is hooked to an outer peripheral portion of the driving pulley 3, thereby transmitting a driving force of the driving motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode winding device for winding a band-shaped material such as an electrode and an insulating sheet incorporated in a prismatic battery.

[0002]

2. Description of the Related Art A rectangular battery is spirally wound in a case body by winding a strip-shaped electrode body in which a strip-shaped positive electrode and a strip-shaped negative electrode are alternately superimposed via a separator, which is an insulating sheet, around a core. And a built-in electrode body. The electrode body is manufactured using a winding device that drives a winding core and winds a strip-shaped electrode body around its outer peripheral surface.

[0003] When manufacturing an electrode assembly incorporated in a prismatic battery, the winding device for the electrode assembly is provided with a winding core for the convenience of removing the electrode assembly after the winding operation is completed. However, there is used one whose cross-sectional shape is formed such that the length of the major axis and the minor axis are different, such as a rhombus or an ellipse.

[0004] In the winding device for an electrode body, when a core having a rhombus or elliptical cross section is used, the major axis and the minor axis of the core differ from each other. Even when driven at a constant speed, the peripheral speed of winding the band-shaped electrode body periodically fluctuates greatly because the outer diameter of the outer peripheral portion is different. Further, in the winding device of the electrode body, the speed of the strip-shaped electrode body that is wound is also periodically changed in synchronization with the periodic change of the peripheral speed of the winding core. For this reason, it is difficult for the winding device for the electrode body to wind the band-shaped electrode body around the core with a constant tension, and there has been a problem that a large winding deviation occurs in the thickness direction of the band-shaped electrode body.

For this reason, in a conventional winding device for an electrode body, the driving speed of the winding core depends on the shape of the winding core in order to prevent the winding deviation by winding the band-shaped electrode body at a constant tension. Thus, a method has been employed in which the winding speed of the winding core is controlled for each rotation angle to wind the strip-shaped electrode body at a constant speed and a constant tension. Further, in a conventional winding device for an electrode body, a method has been employed in which the speed at which the strip-shaped electrode body is fed out is made constant, and the speed is fed back to a drive motor to control the winding speed of the core.

[0006]

However, in the conventional winding device for an electrode body, even when the winding speed of the winding core is controlled as described above, the behavior of the drive motor for driving the winding core is always increased. It responded with a certain delay to the change in the cross-sectional shape of the core. For this reason, in a winding device for an electrode body, when a winding core having an elliptical shape or the like is used, the flatness of the cross-sectional shape increases, that is, as the difference between the major axis and the minor axis increases, the winding also increases. As the speed increases, the above-described delay in the response of the motor becomes significant. When the phase difference between the change in the cross-sectional shape of the winding core and the change in the driving speed of the motor increases, not only the winding speed of the winding core cannot be smoothed, but also the winding deviation of the strip-shaped electrode body increases. There has been a problem of exhibiting increasing behavior.

In the electrode winding device, the winding is thickened by an amount corresponding to the band-shaped electrode body on which the winding core is wound, the ratio of the long axis to the short axis of the sectional shape is changed, and the winding core is formed in the band-shaped electrode. There has been a problem that the range in which the body winding speed fluctuates also changes.

For this reason, in the conventional winding device for an electrode body, the speed of winding the strip-shaped electrode body around the winding core has to be reduced in order to prevent a winding deviation, which causes a significant decrease in productivity.

In view of the above, the present invention has been made to prevent the winding of the strip-shaped electrode from being unwinding by making the winding speed of the winding core formed in an elliptical shape or the like smooth regardless of the winding amount. It is an object of the present invention to provide a winding device for winding an electrode body.

[0010]

According to a first aspect of the present invention, there is provided a winding device for an electrode body, wherein a cross-sectional shape of the electrode body is different from that of a major axis and a minor axis in length. A winding core for winding a strip-shaped electrode body in which the positive electrode and the negative electrode are alternately superimposed via an insulating sheet, and a driving pulley for rotating the winding core and changing the outer shape to a shape similar to the cross-sectional shape of the winding core. And a drive belt that is hung on the outer periphery of the drive pulley to transmit the rotation of the winding motor.

According to the winding device for an electrode body according to the present invention configured as described above, the shape of the driving pulley for driving the winding core whose outer shape changes according to the winding amount of the strip-shaped electrode body is wound. By gradually changing the winding speed of the strip electrode body, the winding speed of the winding core can be smoothed without lowering the winding speed of the strip electrode body, thereby preventing the winding of the strip electrode body.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a specific embodiment of a winding device for an electrode body according to the present invention will be described in detail with reference to the drawings. The winding device 1 for an electrode body according to the present embodiment is configured such that a band-shaped positive electrode and a band-shaped negative electrode are spirally wound on a band-shaped electrode body S, which is alternately stacked via a separator that is an insulating sheet, to form a rectangular battery. This is for manufacturing an electrode body incorporated in the device. As shown in FIG. 1, the winding device 1 includes a winding core 2 that winds the strip-shaped electrode body S, a driving pulley 3 that rotationally drives the winding core 2, and a shape adjustment mechanism 4 that deforms the shape of the driving pulley 3. And a drive belt 5 to be hung on the drive pulley 3 are supported by a base 6 and a support panel 7.

The winding core 2 is attached to the end of a winding shaft 9 rotatably supported by a winding bush 8 and is disposed so as to protrude from the support panel 7. The core 2 is formed in a cross-sectional shape in which the major axis and the minor axis have different lengths, for example, an elliptical shape, and the belt-shaped electrode body S is wound on the outer peripheral surface thereof. Core 2
Is the major axis of the cross-sectional shape of the winding core 2 including the band-shaped electrode body S wound on the outer peripheral surface of the winding core 2, that is, the shape of the portion where the band-shaped electrode body S is wound up according to the amount by which the band-shaped electrode body S is wound. And the elliptical ratio which is the ratio of the minor axis changes. In addition, core 2
As described above, the winding speed for each rotation angle also changes due to the change in the shape of the portion where the band-shaped electrode body S is wound as described above.

The drive pulley 3 is mounted directly on the winding shaft 9. The drive pulley 3 is, as shown in FIG.
The drive belt 5 that has been multiplied by 1 is multiplied. The drive pulley 3 is rotationally driven by the rotation of the drive motor 10 being transmitted, and also rotationally drives the winding shaft 9 and the winding core 2 attached to the winding shaft 9.

As shown in FIG. 3, each of the drive pulleys 3 has a first connecting member 12 and a second connecting member 12 each of which has an arc-shaped plate-like four belt engaging pieces 3a to 3d on which the drive belt 5 is engaged.
, And are combined in an elliptical cylindrical shape. The drive pulley 3 is formed in a shape similar to the cross-sectional shape of the core 2, that is, an elliptical shape having the same elliptical ratio as the cross-sectional shape of the core 2. The winding device 1 is configured such that the drive pulley 3 has a shape similar to that of the winding core 2, so that the ratio of the size of the winding core 2 to the size of the driving pulley 3 and the speed of the strip-shaped electrode body S with respect to the speed of the driving belt 5. The ratio becomes equal, and it is possible to absorb the periodic fluctuation in the speed at which the band-shaped electrode body S is wound at each rotation angle of the core 2.

The first connecting member 12 connects the belt engaging pieces 3a to 3d to each other at one end surface of the driving pulley 3. The first connecting member includes a connecting pin 14 provided at each end of the belt engaging pieces 3a to 3d.
And is movable by being fitted in a connection hole (not shown) formed corresponding to the shape of the connection pin 14.

The first connecting member 12 is a connecting point of the driving pulley 3 in the height direction, that is, the ends of the belt engaging pieces 3a and 3d and the belt engaging pieces 3b and 3b.
c to the upper connecting member 15 and the lower connecting member 1 respectively.
And 6. The upper connecting member 15 is formed in an L-shaped cross section, and is provided with a roller 17 whose both ends are rotatably supported in an inner chamber thereof. The lower connecting member 16 is formed in the same manner as the upper connecting member 15 and is provided with a roller 18. The rollers 17 and 18 rotate so as to wind the adjuster 21 when the adjuster 21 described later is fitted, and the adjuster 21 is fitted smoothly.

The first connecting member 12 is connected to the upper connecting member 15 and the lower connecting member 16 by a spring (not shown).
Are biased in a direction to close the gap. First
Of the upper connecting member 15 and the lower connecting member 1
In a state where the space between the core 6 is closed, the shape of the drive pulley 3 is formed to be similar to the cross-sectional shape of the core 2 itself. That is, the first connection member 12 holds the shape of the drive pulley 3 that can be deformed to be similar to the cross-sectional shape of the core 2 unless the space between the upper connection member 15 and the lower connection member 16 is widened.

The second connecting member 13 movably connects the belt engaging pieces 3a to 3d to each other at the other end surface of the driving pulley 3 in the same manner as the first connecting member 12. Second
Of the belt pulling piece 3a and the belt hooking piece 3d and the end of the belt hooking piece 3b and the belt hooking piece 3c at the connecting point in the height direction of the drive pulley 3 combined with the elliptical shape. They are connected by the second connecting member 13a.
The second connecting member 8 connects the ends of the belt engaging pieces 3a and 3b and the ends of the belt engaging pieces 3c and 3d at a connecting point in the width direction of the driving pulley 3 with a second connection. They are connected by a member 13b. Second connecting member 1
3a has a groove 19 formed on the opposite main surface to which the drive pulley 3 is connected. Also, the second connecting member 13b
Has a projection 20 on the opposite main surface to which the drive pulley 3 is connected.
Are formed.

The shape of the drive pulley 3 is changed according to the amount of winding of the strip-shaped electrode body S wound by the winding core 2 by the shape adjusting mechanism 4. In the winding device 1, the cross-sectional shape of the winding core 2 including the wound strip electrode body S changes depending on the amount of the strip electrode body S wound by the winding core 2, and the speed at which the strip electrode body S is wound is reduced. The fluctuating range changes. For this reason, the winding device 1 changes the shape of the drive pulley 3 in synchronization with the change in the cross-sectional shape of the winding core 2 including the portion of the wound strip-shaped electrode body S. This corresponds to a change in the range of the winding speed of the body S.

The shape adjusting mechanism 4 includes an adjuster 21 and a guide member 22. The adjuster 21 is formed in a conical shape, and is adjusted and moved in the axial direction by a servo actuator 23 in an adjustment operation described later. The tip of the adjuster 21 is fitted between the rollers 17 and 18 provided on the first connecting member 12 and presses the upper connecting member 15 and the lower connecting member 16 in a direction in which the two are separated from each other. The servo actuator 23 calculates the relationship between the previously calculated amount of the wound strip electrode body S and the change in the elliptic ratio of the cross-sectional shape of the core 2 including the wound strip electrode body S. The adjuster 21 is adjusted and moved based on the adjustment.

The guide member 22 includes a guide shaft 2 having a guide shaft 25a and a guide groove 26 formed on the main surface of the base 24.
5b. The guide shaft 25a is
And guides the moving range of the second connecting member 13a and the deformation range of the driving pulley 3 in the height direction. The protrusion 20 formed on the second connecting member 13b is fitted into the guide groove 26 of the guide shaft 25b, and guides the moving range of the second connecting member 13b and the deformation range of the driving pulley 3 in the width direction. The guide member 22 guides the movement of the second connecting members 13a and 13b, respectively, and restricts the moving trajectory.
The range in which the deformable drive pulley 3 can be deformed is limited to prevent the drive pulley 3 from being deformed into a shape far from the cross-sectional shape of the core 2.

The winding device 1 starts the winding of the strip-shaped electrode body S and the rollers 17 and 18 of the first connecting member 12.
Before the pointed end of the adjuster 21 is fitted between the upper and lower connecting members 15 and 16 of the first connecting member 12 for connecting the drive pulley 3, the upper connecting member 15 and the lower connecting member 16 are closed by the urging force of the spring. . Therefore, the drive pulley 3 is formed and held in a predetermined shape, that is, a shape similar to the cross-sectional shape of the core 2 itself, as shown in FIG. 4A.

The winding device 1 starts the winding of the strip-shaped electrode body S and the rollers 17 and 18 of the first connecting member 12.
When the sharp end of the adjuster 21 is fitted between the two and the adjustment operation is performed, the space between the upper connecting member 15 and the lower connecting member 16 pressed by the adjuster 21 is opened. Drive pulley 3
Since the ends of the belt engaging pieces 3a to 3d are connected by the upper connecting member 15 and the lower connecting member 16, the respective belt engaging pieces 3a to 3d are pulled by the upper connecting member 15 and the lower connecting member 16. Can be Therefore, as shown in FIG. 4B, the shape of the driving pulley 3 is expanded in the height direction and converged in the width direction.

That is, for example, the winding device 1 winds the strip electrode body S around the winding core 2 having a width of 23 mm, a height of 8 mm, and an elliptic ratio of 2.88 in a state where the strip electrode body S is not wound. 30.5mm in width, 15.5mm in height, 1.9 aspect ratio
When the spiral electrode body 7 is manufactured, the drive pulley 3 is deformed as follows.

First, the winding device 1 adjusts the elliptical ratio of the drive pulley 3 to the elliptical ratio 2.88 of the winding core 2 itself, for example, a width of 115.2 mm, a height of 40 mm, and an elliptical ratio of 2.88.
The belt engaging pieces 3a to 3d are combined so as to form the elliptical shape, and the shape is held by connecting the first connecting member 12.

In order to deform the shape of the drive pulley 3 in accordance with the amount by which the strip-shaped electrode body S of the winding core 2 is wound, the winding device 1 has the tip of the adjuster 21 connected to the first connecting member. Twelve rollers 17 and 18 are fitted. The adjuster 21 has a drive pulley having a width of 109.5 mm, a height of 56 mm, and an elliptical ratio of 1.97 by the servo actuator 23.
Is adjusted until it becomes elliptical, and its pointed end is fitted.

As shown in FIG. 2, the drive belt 5 is hung on the drive pulley 3 and the output pulley 11 of the drive motor 10 to transmit the torque of the drive motor 6 output by the output pulley 11 to the drive pulley 3. . The drive belt 5 is
The drive pulley 3 is driven by the drive motor 10 at the same angle as the angle at which the strip-shaped electrode body S wound around the core 2 is wound around the core 2.
Has been multiplied.

The drive belt 5 is hung on a plurality of guide rollers 27. The guide roller 27 is urged by a spring (not shown) to apply tension to the drive belt 5 and absorb slack in the drive belt 5 caused by rotation of the drive pulley 3 having a different peripheral speed depending on the rotation angle. I do.

The winding device 1 includes a winding core 2 from before the winding of the strip-shaped electrode body S until the winding is completed, as described above.
Since the shape of the drive pulley 3 for rotatingly driving the winding core 2 changes in accordance with the elliptic ratio of the cross-sectional shape of, the winding speed of the strip-shaped electrode body S can be smoothed.

[0031]

According to the winding device for an electrode body according to the present invention, the shape of the driving pulley for driving the winding core is made similar to the cross-sectional shape of the winding core, thereby smoothing the winding speed of the winding core. Become For this reason, the winding device of the electrode body according to the present invention,
Enables winding of the band-shaped electrode body under a constant tension, reduces winding deviation of the band-shaped electrode body, and stabilizes the quality related to the basic performance of the battery such as internal short-circuit due to the winding deviation of the band-shaped material. be able to. Further, the winding device for an electrode body according to the present invention can perform winding without lowering the winding speed of the band-shaped electrode body by reducing the winding deviation of the band-shaped electrode body by smoothing the winding speed. ,
Productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a winding device for an electrode body.

FIG. 2 is a rear view of a main part of a winding device for an electrode body.

FIG. 3 is an exploded perspective view for explaining a shape adjusting mechanism.

FIG. 4A is a diagram showing a normal state of a driving pulley,
b is a diagram showing a state in which the driving pulley is deformed by the adjuster.

[Explanation of symbols]

1 winding device, 2 winding core, 3 drive pulley, 3a-3
d Belt engaging piece, 4 shape adjusting mechanism, 5 drive belt,
10 drive motor, 12 first connecting member, 13 second
Connecting member, 21 adjuster, 22 guide member, S-shaped electrode body

Claims (4)

[Claims] 1. A belt-like electrode body having a cross-sectional shape different in length between a major axis and a minor axis and winding a belt-like positive electrode and a negative electrode alternately through an insulating sheet. A winding core, a driving pulley that drives the rotation of the winding core and whose outer shape is changed to be similar to the cross-sectional shape of the winding core, and a drive that is hung on the outer peripheral portion of the driving pulley to transmit rotation of the winding motor. A belt, wherein the drive pulley has an outer shape that is gradually changed according to a change in the shape of the winding core that is changed by a winding amount of the strip-shaped electrode body wound around the winding core by a shape adjusting mechanism. Winding device for an electrode body. 2. The driving pulley, comprising: a plurality of belt engaging pieces; and a first connecting member and a second connecting member which rotatably connect both ends of the belt engaging pieces, respectively. Claim 1.
3. The winding device for an electrode body according to claim 1. 3. The shape adjusting mechanism includes an adjuster that moves the belt engaging pieces in a direction to expand or converge via the first member, and a guide member that guides the second member. The winding device for an electrode body according to claim 2, wherein 4. The electrode body according to claim 1, wherein an angle at which the drive belt is engaged with the drive pulley is the same as an angle at which the band-shaped electrode body is wound around the winding core. Winding device.